Protection Functions
PRS-7367 89
activated.
59P_Vol_Str is the start value for the voltage.
The time characteristic is according to DT. When the operation timer has reached the value set by
59P_Op_T, the 59P_Op output is activated. If the positive sequence voltage normalizes before the
module operates, the reset timer is activated. If the reset timer reaches 30ms, the 59P_Op output
is deactivated.
The binary input 59P_Blk can be used to block the function. The activation of the 59P_Blk input
deactivates all outputs and resets internal timers. The binary input 59P_Blk_Str can be used to
block the start signals. The binary input 59P_Blk_Op can be used to block the operation signals.
3.12.3 59P Application Scope
59P is applied to power system elements, such as generators, transformers, motors and power
lines, to detect overvoltage conditions.
59P can be used in combination with low-current signals or a directional reactive overpower
function to identify the distribution line with an open remote end. 59P can also be used to initiate
voltage correction measures like insertion of shunt reactors or switching out capacitor banks to
control the voltage.
59P prevents sensitive equipment from running overvoltage conditions causing the equipment to
overheat or stress on insulation material.
3.12.4 59P Settings
Table 3.12-3 59P settings
3.13 Residual overvoltage protection 59G
3.13.1 59G Overview
This relay provides a zero sequence overvoltage protection with definite time delay characteristics.
The residual voltage can be calculated internally based on the measurement of the three-phase
voltage. This voltage can also be measured by a single-phase voltage transformer, located
between a transformer star point and earth, or by using an open-delta connection of three
single-phase voltage transformers.
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